Chair and stool.



L. E. HUBERT. CHAIR AND STOOL. APPLICATION FILED FEB. 8, 1909.

' Patented June 1, 1909. I

'rns: NORRIS Pincus 5a., wasnmamu, n. c

. LUDGER E. HUBERT, OF LOWELL, MASSACHUSETTS.

QHAIR AND STOOL.

Specification of Letters Patent.

Patented June 1, 1909;.

' Application filed. February 8, 1909. Serial No. 476,595.

To all whom 'it may concern:

Be it known that I, LUDGER E. HUBnR'r,-a citizen of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Chairs and Stools, of which the following is a specification.

' This invention relates to chairs and stools provided with either revolving or vertically adjustable seats, or with seats" which are both revoluble and adjustable as revolving chairs and piano-stools.

The object of said invention is to secure a lighter, cheaper, stronger and more durable constructionanglto facilitate repairs if such should be necessary and is accomplished by securing the sleeve-nut which guides the spindle or screw'more rigidly in place by means hereinafter described.- x

Said invention allows the pedestal or pillar commonly used to be dispensed with, thus making the chairor stool much lighter and of less cost than heretofore, prevents wabbling of the seat and the loosening of the sleeve-nut, and facilitates the removal of said sleeve-nut in case of breakage and, of course, lessens the cost of setting up and knocking down for purposes of transportation.

In the accompanying drawing, Figure 1 is a vertical central section of the seat of a revolving and vertically adjustable chair or stool and the parts which constitute my invention; Fig. 2 is a horizontal cross-section on the line 2 2 in Fig. 1; Fig. 3 is a front elevation of the sleeve-nut and a vertical section of the adjacent parts; Fig. 4:, a front elevation of a revolving and vertically adjustable stool provided with my improvement, omitting one of the legs.

The seat A has secured toits under side a plate B by means of screws 6, said plate havin a central hub 5 provided with a central opening 6 which tapers upwardly to receive and fit the tapering upper end 0 of the externally screw-threaded spindle C ;these parts being of the usual construction.

The sleeve-nut D is internally screwthreaded at d to engage the screw-threaded spindle, substantially as heretofore used. Externally said sleeve-nut D is provided at its upper end with a flanged which rests upon the top E and below said flange is provided with a relatively coarse external screw-thread d which is notched, as at d", preferably, at least once in every turn of the screw, to cut an internal 'screwthread in said top E for its reception, the hole 0 for the reception of said sleeve-nut being of the same diameter as the external root-diameter of said sleeve-nut or just large enough to admit the barrel of said sleeve-nut.

Below the top E, the sleeve-nut D is reduced at d to pass through a washer F but is provided on saidreduced part d? with a projection or spline (Z which fits a corresponding key-seat or groove f which extends radially from the eye of said washer and prevents said sleeve'nut and washer from turning in or on each other. The washer F is provided with upwardly proj ecting points or prongs f which enter the underside of the top E and prevent the washer and the sleeve-nut D from turning on said top E.

'lhered-uced part 03 of the sleeve-nut D below the spline (2* is provided with another externally screw-thread d (finer than the thread 41 on which is turned an internally threaded holding-nut G up against the washer F forcing the prongs f into the underside of the top and to retain said prongs in said top.

When the washer F is in place, its prongs prevent the turning of said washer and the washer with its seat engaging the spline d prevents the turning of the sleeve-nut D in the top E.

The holding-nut G is represented as provided with notches g to engage a spanner or wrench for turning said nut.

The top E is supported by legs H repre sented as united by braces I in-an obvious manner.

The flange d, the washer F and the hold- .ing nut G prevent any vertical movement of the sleeve-nut D in the top E and with the coarse screw-thread al make any movement of said sleeve-nut in said top impoS- sible without loosening said holding nut.

If necessary for any reason, the sleevenut D may be unscrewed from the top E after removing the holding nut G and washer F.

By omitting the internal screw-thread of the sleeve-nut and the thread of the screw spindle, this invention may be applied to chairs and stools, the seats of which are capable of turning without vertical movement.

'I claim as my-inventionz l. The combination in a chain or stoolL- of a sleeve adapted to pass through a top and to receive a spindle and having an external screw-thread and below said thread having a reduced p'a'rt provided witha'- splineor projection, a washer having a key-seat to receive said spline and provided with prongs to enter the under side of said top, and a nutengaging another screw-thread, with which saidv reduced part is provided below said spline.

2. The combination in a chair or stool, of a sleeve adapted to pass through a top and having at its upper end an external flange to rest on said top and having an external screw-thread and having below said thread a reduced partlp'rovided with a spline; a washer having a key-seat" to receive said spliiieand provided witlr prongs to enter the under side of said top, and a nut engaging another. screw-thread, with which said reduced part is provided below said spline.

3. The combination in a chair or stool, of asleeveadapted to pass through: a top and having an external screw-thread notched to form cutting edges and below said thread,

having a reduced part provided with a.

spline, a washer having a key-seat to receive said spline and provided with prongs to enter the under side of said top, and a 

